Quiz for Enzymes

Q1: What type of biomolecules are enzymes?

A. Proteins B. Carbohydrates C. Lipids D. Nucleic acids

Q2: Which of the following affects enzyme activity?

A. pH B. Temperature C. Substrate concentration D. All of the above

Q3: The active site of an enzyme is:

A. Where substrate binds B. Where enzyme is produced C. Where enzyme is degraded D. Allosteric site

Q4: Which model explains enzyme specificity?

A. Lock and Key model B. Fluid mosaic model C. Induced fit model D. Bohr model

Q5: Enzymes increase reaction rate by:

A. Raising activation energy B. Lowering activation energy C. Increasing temperature drastically D. Changing equilibrium constant

Q6: Which enzyme breaks down starch?

A. Protease B. Lipase C. Amylase D. Lactase

Q7: Which of the following is an allosteric enzyme?

A. Hexokinase B. Phosphofructokinase C. Lactase D. Pepsin

Q8: What is the effect of increasing substrate concentration on enzyme activity?

A. Decreases activity B. Increases activity then plateaus C. No effect D. Stops reaction

Q9: Competitive inhibitors bind to:

A. Active site B. Allosteric site C. Substrate D. Product

Q10: Non-competitive inhibitors bind to:

A. Active site B. Allosteric site C. Substrate D. Product

Q11: Enzymes are specific to:

A. One substrate B. One product C. Any substrate D. Any product

Q12: Enzyme activity is maximum at:

A. Extreme pH B. Optimum pH C. Room temperature D. Freezing temperature

Q13: Denaturation of enzymes results in:

A. Loss of primary structure B. Loss of secondary and tertiary structures C. Increased activity D. Change in substrate

Q14: Which vitamin is a coenzyme in oxidation reactions?

A. Vitamin C B. Vitamin K C. Vitamin B1 (Thiamine) D. Vitamin B2 (Riboflavin)

Q15: Enzymes that catalyze the transfer of functional groups are called:

A. Hydrolases B. Transferases C. Oxidoreductases D. Lyases

Q16: Which enzyme catalyzes the breakdown of proteins?

A. Lipase B. Protease C. Amylase D. Lactase

Q17: The inactive form of an enzyme is called:

A. Apoenzyme B. Holoenzyme C. Zymogen D. Coenzyme

Q18: Enzymes are sensitive to:

A. Temperature only B. pH only C. Both temperature and pH D. None

Q19: Which enzyme catalyzes conversion of glucose to glucose-6-phosphate?

A. Hexokinase B. Lactase C. Lipase D. Amylase